Utilize list separator characters instead of hard-coded characters.
Updated LuaDoc.
Removed `HIGHLIGHT_BRACES` option; modules/textadept/editing.lua
Setting the style of `INDIC_BRACEMATCH` to `INDIC_HIDDEN` effectively disables
brace highlighting.
Fixed bug in highlighting a word from its end; modules/textadept/editing.lua
Removed `textadept.editing.select_indented_block()`.
Textadept's menus may be edited in-place via the `textadept.menu` module.
Any changes, even incremental ones, are reflected immediately.
As a result, removed `set_menubar()` and `set_contextmenus()` from API.