Improve vimrc to include more information and settings

+ Add more binds, even if left default, for reference or quick adjusting
+ Adjust sourcerer.vim for ultra-black background
+ Set clang_complete to use snippets for code completion in C / C++
+ Set clang_complete binds jump-to declaration and jump-out to + and _ respectively
+ Add information to vimrc to allow adjusting clang options
+ Highlight column 80 on cpp and c files
+ Revert to unicode symbols by default, left powerline symbols commented out for now

.vim/colors/sourcerer.vim

@@ -21,7 +21,7 @@ let colors_name = "sourcerer"
 
 
 "  █▓▒░ GUI colors
-hi Normal       guifg=#c2c2b0 guibg=#222222 gui=NONE
+hi Normal       guifg=#c2c2b0 guibg=#000000 gui=NONE
 hi ColorColumn  guifg=NONE    guibg=#1c1c1c
 hi Cursor       guifg=NONE    guibg=#626262 gui=NONE
 hi CursorColumn guibg=#2d2d2d