Remove some unused languages from our ace build
Remove removed language references from ext-modelist
Remove empty snippets from ace build

This removes 69 useless snippet files in total, which is quite a lot …
Refactor perl regex find/replace to PSED function
Improve robustness of (ace) build.sh when stripping languages
Remove some extra unused modes

powershell
asciidoc
apache_conf
ada
soy_template
verilog
vhdl
autohotkey
batchfile
c9search
Merge pull request #231 from FriendCode/improve/remove_unused_ace_languages

Remove some unused languages from our ace build

Remove ~70 empty snippet files

Brining ace distrib from 209 files to 130