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

syntax/arch.vim

@@ -0,0 +1,45 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'arch') == -1
+
+" Vim syntax file
+" Language:             GNU Arch inventory file
+" Previous Maintainer:  Nikolai Weibull <now@bitwi.se>
+" Latest Revision:      2007-06-17
+
+if exists("b:current_syntax")
+  finish
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+setlocal iskeyword+=-
+
+syn keyword archTodo    TODO FIXME XXX NOTE
+
+syn region  archComment display start='^\%(#\|\s\)' end='$'
+                        \ contains=archTodo,@Spell
+
+syn match   archBegin   display '^' nextgroup=archKeyword,archComment
+
+syn keyword archKeyword contained implicit tagline explicit names
+syn keyword archKeyword contained untagged-source
+                        \ nextgroup=archTMethod skipwhite
+syn keyword archKeyword contained exclude junk backup precious unrecognized
+                        \ source nextgroup=archRegex skipwhite
+
+syn keyword archTMethod contained source precious backup junk unrecognized
+
+syn match   archRegex   contained '\s*\zs.*'
+
+hi def link archTodo    Todo
+hi def link archComment Comment
+hi def link archKeyword Keyword
+hi def link archTMethod Type
+hi def link archRegex   String
+
+let b:current_syntax = "arch"
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+endif