N°2982 - Speed up SCSS themes compilation during setup : take cascaded included imports in theme precompilation + class/method documentation cleanup

test/application/theme-handler/expected/css/multi_imports.scss

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+
+
+@import 'included_file1.scss';
+@import 'included_scss/included_file2.scss';
+
+/*!
+ * Combodo portal template v1.0.0
+*/

test/application/theme-handler/expected/css/short_cut.scss

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+
+@import 'included_file3';

test/application/theme-handler/expected/css/simple_import.scss

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+
+@import 'included_file1.scss';

test/application/theme-handler/expected/css/simple_import2.scss

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+
+@import 'included_scss/included_file2.scss';