Doc: Copy icons from sources to \doc\qtcreator\images\icons

- Fix the paths to them in .qdoc files
- Remove paths to source folders from .qdocconf files

This is the second step towards making the icons visible in both
dark and light online doc modes.

Task-number: QTCREATORBUG-26644
Change-Id: I6995ea716df78cf0f285175515d1466ee20e317b
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

doc/qtcreator/src/howto/creator-help.qdoc

@@ -140,7 +140,7 @@
 
     \list 1
 
-        \li Click the \inlineimage bookmark.png
+        \li Click the \inlineimage icons/bookmark.png
             (\uicontrol {Add Bookmark}) button on the toolbar.
 
         \li In the \uicontrol {Add Bookmark} dialog, click \uicontrol OK to save the
@@ -188,7 +188,7 @@
 
     If you cannot find words that you know are there, indexing might not have
     been completed for some reason. To regenerate the index, click
-    \inlineimage reload_gray.png
+    \inlineimage icons/reload_gray.png
     (\uicontrol {Regenerate Index}).
 
     Punctuation is not included in indexed terms. To find terms that contain
@@ -225,7 +225,7 @@
     in the \uicontrol {On context help} field. To detach the help window, select
     \uicontrol {Always Show in External Window}.
 
-    To change this setting in a help view, select the \inlineimage linkicon.png
+    To change this setting in a help view, select the \inlineimage icons/linkicon.png
     toolbar button.
 
     \section1 Selecting the Start Page
@@ -266,7 +266,7 @@
 
             \image qtcreator-help-filter-attributes.png "Filters tab in Help options"
 
-        \li Select \inlineimage plus.png
+        \li Select \inlineimage icons/plus.png
             to add a new filter in the \uicontrol {Add Filter} dialog.
 
         \li In the \uicontrol {Filter name} field, enter a name for the filter,
@@ -291,6 +291,6 @@
 
     To rename the selected filter, select \uicontrol Rename.
 
-    To remove the selected filter select \inlineimage minus.png
+    To remove the selected filter select \inlineimage icons/minus.png
     .
 */

doc/qtcreator/src/howto/creator-only/creator-autotest.qdoc

@@ -325,7 +325,7 @@
         \li In the \uicontrol {Test Results} output pane, select:
 
             \list
-                \li \inlineimage run_small.png
+                \li \inlineimage icons/run_small.png
                     (\uicontrol {Run All Tests}) to run all tests.
                  \li \inlineimage icons/qtcreator-run-selected-tests.png
                     (\uicontrol {Run Selected Tests}) to run the selected tests.
@@ -376,14 +376,14 @@
     To refresh the view, select \uicontrol {Rescan Tests} in the context menu.
 
     To show or hide init and cleanup or data functions in the \uicontrol Tests
-    view, select \inlineimage filtericon.png
+    view, select \inlineimage icons/filtericon.png
     (\uicontrol {Filter Test Tree}), and then select \uicontrol {Show Init and
     Cleanup Functions} or \uicontrol {Show Data Functions}. Double-click a
     function in the list to open its source code in the code editor.
 
     The test cases are listed in alphabetic, case insensitive order. To list
     them in the order in which they are defined in the source code,
-    select \inlineimage leafsort.png
+    select \inlineimage icons/leafsort.png
     (\uicontrol {Sort Naturally}).
 
     \section2 Running and Debugging Tests from Code Editor
@@ -592,7 +592,7 @@
     To view the results of Qt tests as plain text, select \uicontrol Tools >
     \uicontrol Options > \uicontrol {Testing} > \uicontrol {Qt Test}, and
     then deselect the \uicontrol {Use XML output} check box. Then select the
-    \inlineimage text.png
+    \inlineimage icons/text.png
     (\uicontrol {Switch Between Visual and Text Display}) button in the
     \uicontrol {Test Results} output pane to switch to the text display.
 
@@ -668,7 +668,7 @@
     \endtable
 
     To view only messages of a particular type, select
-    \inlineimage filtericon.png
+    \inlineimage icons/filtericon.png
     (\uicontrol {Filter Test Results}), and then select the types of messages to
     show. To show all messages, select \uicontrol {Check All Filters}. To
     deselect all message types, select \uicontrol {Uncheck All Filters}.

doc/qtcreator/src/howto/creator-only/creator-how-tos.qdoc

@@ -160,11 +160,11 @@
 
     You can toggle the left and right sidebar in some \QC modes.
 
-    To toggle the left sidebar, click \inlineimage leftsidebaricon.png
+    To toggle the left sidebar, click \inlineimage icons/leftsidebaricon.png
     (\uicontrol {Hide Left Sidebar/Show Left Sidebar}) or press \key Alt+0
     (\key Cmd+0 on \macos).
 
-    To toggle the right sidebar, click \inlineimage rightsidebaricon.png
+    To toggle the right sidebar, click \inlineimage icons/rightsidebaricon.png
     (\uicontrol {Hide Right Sidebar/Show Right Sidebar}) or press
     \key Alt+Shift+0 (\key Cmd+Shift+0 on \macos).