Do not cache `_G.arg`; core/args.lua
This also helps fix a bug caused in part by r1557.
Updated Lua Adeptsense.
Fixed typo; doc/12_Compiling.md
Updated CHANGELOG.md.
Added tag textadept_7.0_beta_3 for changeset 5ebbc96b1ec1
Changed `events.disconnect()` to accept function argument instead of ID.
Code cleanup in themes.
Updated some LuaDoc.
Removed some unused constants from `_SCINTILLA.constants`.
Do not convert filenames to UTF-8; keep them in `_CHARSET`.
Moved custom markers and indicators into themes and added more properties.
Removed the `SC_` prefix from constants in `_SCINTILLA.constants`.
Also removed more unused constants.
Removed the `SC` prefix from most constants in `_SCINTILLA.constants`.
Changed symbol marker margin settings; properties.lua
Updated Lua Adeptsense.