Cleaned up vimrc file
Grouped all <Leader> and <Function> mappings
Added a new mapping for <Ctrl><Shift>F to find all
Removed mappings for <Ctrl><Shift>f and moved them to <Leader>f
in normal and visual mode. Vim doesn't distinguish between <C-f>
and <C-S-f> which fucks up the paging for <C-f>, so no find in
insert mode for now.