Fixed an issue when configuration file options partly ignored when `--project-conf` // Resolve #3034 (#3055)

* Fixed an issue when configuration file options partly ignored when using custom ``--project-conf`` // Resolve #3034

* Py2 compatible makedirs

* Fix circle dependency

* Fix broken import in test examples

* Fix history

* Remove YAPF markers

* PyLint fix

* Fix invalid project conf path

* Move PIO Core to the root on Windows, issue with long CPPPATHs

* Respect global PLATFORMIO_BUILD_CACHE_DIR env var

* Fix Appveyor paths

* Minor changes

platformio/managers/package.py

@@ -405,7 +405,7 @@ class PkgInstallerMixin(object):
                     self.parse_semver_version(manifest["version"], raise_exception=True)
                 ):
                     continue
-                elif not best or (
+                if not best or (
                     self.parse_semver_version(manifest["version"], raise_exception=True)
                     > self.parse_semver_version(best["version"], raise_exception=True)
                 ):