build scripts: code which prints log message about created artifact moved to BuildMessageLogger and implemented properly for TeamCity

AtomicNotNullLazyValue#createValue overrides NotNullLazyValue#createValue intentionally (following IDEA-CR-13011)

build scripts: 'brandingModule' property replaced by 'brandingResourcePaths' to support cases when resources aren't located under module source roots (e.g. in PhpStorm)

build scripts: replace 'until-build' during build if it is already set in plugin.xml (some plugins set it to 999.999)

When retrieving language indent options use LanguageUtil.getLanguageForPsi instead of FileType.getLanguage, since for scratches it is always plain text (fixes IDEA-156091)

* make prompt hooks extension compatible with hg > 3.8.3;
* password manager -> find user password method signature was changed;
* module urllib2 usages  were changed to urlreq and urlerr;

* filter inapplicable expressions without loading AST if possible, via approximate resolve
* for that, store the approximate call chains in index
* iterate over files once, not for each empty marker Runnable interface separately
* don't rely on generic method parameter index: it's huge, memory-hungry and works only in Java

According to PEP 420, if any non-namespace package is found in the
Python paths, then it is used as the import result. If several
namespace packages are found, then the import result is a namespace
package that contains every module within them.