Add utility for doing exec()
Add exec function stub to action context
Add implementation for func_exec()
Add @warning in ws_string_raw() that it actually allocates

This _always_ gets me.
Merge pull request #428 from matthiasbeyer/add-exec_command

Add command for starting an application
Add (helper) function (without impl.) for moving a shell surface
Add command function for moving a shell surface
Merge pull request #426 from matthiasbeyer/add-shell_surface_pos_set_function

Add command function for shell surface to set position
Set function table

Someone forgot to actually _set_ the function table.
Merge pull request #437 from neithernut/fix-use_function_table

Set function table
Add documentation to ws_value_union_reinit()
Add missing memberof to documentation of ws_value_union_init_from_val()
Merge pull request #452 from neithernut/fix-value-union-documentation

Fix value union documentation
Silence pdflatex
Removed wrong whitespaces
Cleanup ws_string_init()

Do early return, fix semantical blocks.

Pair-programmed-with: Manuel Johannes Messner <manuel.johannes.messner@hs-furtwangen.de>
Cleanup ws_string_set_from_str()

Pair-programmed-with: Manuel Johannes Messner <manuel.johannes.messner@hs-furtwangen.de>
Cleanup ws_string_cat()

- Remove unneccessary variables
- Revert return logic

Pair-programmed-with: Manuel Johannes Messner <manuel.johannes.messner@hs-furtwangen.de>
Minify ws_string_dupl()

Pair-programmed-with: Manuel Johannes Messner <manuel.johannes.messner@hs-furtwangen.de>
Move variable declaration in ws_string_cmp()

Pair-programmed-with: Manuel Johannes Messner <manuel.johannes.messner@hs-furtwangen.de>