Fixed bug where default theme in _USERHOME is not loaded; core/gui.lua
Added quick download links; README.md
Fixed curses autocomplete with the "Enter" key.
This reverts "Enter" to '\r' in Lua, so make a KEYSYM to retain '\n'.
Setting "style." properties updates styles immediately; doc/09_Themes.md
Requires Scintillua r370.
Only set theme and property settings once on startup; core/gui.lua
Fixed broken GTK links; doc/12_Compiling.md
Added Makefile rules for creating cross-platform UI build environments.