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fixes #131: improve w motion
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a few fixes
improve mode handling when repeating commands via '.' that would enter insert mode if issued manually
start implementing # and ? motions
start implementing CTRL+A and CTRL+X commands (add/subtract count to/from number under the cursor)
#143: N should use ?'s input to search backward
#141: collapse selections after pasting in visual line mode
#140: start implementing /<CR> and ?<CR> (counts won't work at the moment)
minor fix
fixes #147: enter insert mode after S (no count)
fixes #139: add {} delimiters to text objects
#148 #149: improve mode handling and enable repetition of commands performed in visual and visual line mode
#152: start implementing {} motions
fix missing return value
#152: start implementing () motions
keep motions within buffer bounds
#148: experiment with a new approach to make repeat (.) work
minor fixes and cleanup #148