ClangTools: Query the tools for supported checks

...instead of hardcoding them for a particular version of
clang-tidy/clazy.

While at it, move also the tidy/clazy widgets to ClangTools as this
simplifies feeding data to them.

Reduce also the built-in configs to a single one using clang-tidy's and
clazy's default checks as they look very reasonable and saves us some
porting effort. Also, our previous built-in configs were just too
numerous.

Change-Id: Ib9297acb7810a940b86a23a8695530506a570394
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cpptools/cpptools.pro

@@ -100,11 +100,9 @@ HEADERS += \
     cursorineditor.h \
     wrappablelineedit.h \
     usages.h \
-    cpptools_clangtidychecks.h \
     cppmodelmanagerinterface.h \
     cppbuiltinmodelmanagersupport.h \
     headerpathfilter.h \
-    cpptools_clazychecks.h
 
 SOURCES += \
     abstracteditorsupport.cpp \
@@ -198,8 +196,6 @@ FORMS += \
     cppcodestylesettingspage.ui \
     cppfilesettingspage.ui \
     clangbasechecks.ui \
-    clazychecks.ui \
-    tidychecks.ui
 
 equals(TEST, 1) {
     HEADERS += \