Some major updates including heuristics

- Allow to define heuristics in heuristics.yaml
- Migrate all filetypes from vim beginning with "a"
- Remove enhanced cpp syntax (it was too slow to load)
- Use setf instead of set ft for setting filetype (faster)
- Override native hauristics with au!
- Add globbing of files for packages
- Replace predefined dirs with extra_dirs and ignored_dirs
- Allow to define proper order of packages with topological sort
- Fix powershell detection
- Lint and fix many packages.yaml issues
- etc etd

ftplugin/awk.vim

@@ -0,0 +1,22 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'awk') == -1
+
+" Vim filetype plugin
+" Language:	awk, nawk, gawk, mawk
+" Maintainer:	Antonio Colombo <azc100@gmail.com>
+" Last Change:	2017 Feb 17
+
+" This plugin was prepared by Mark Sikora
+
+" Only do this when not done yet for this buffer
+if exists("b:did_ftplugin")
+  finish
+endif
+
+" Don't load another plugin for this buffer
+let b:did_ftplugin = 1
+
+let b:undo_ftplugin = "setl commentstring<"
+
+setlocal commentstring=#\ %s
+
+endif