Working on element options. Implemented background-color, background-opacity, line-color, line-opacity, line-width
Fixed line rotating bug by updating base position. Also, implemented line-style modifying.
Implemented text modifying
Working on Z positioning. Refactoring it now
Implemented z positioning
Implemented element copying for the elements, but not yet the action itself, with its event handling
Implemented copying, action, multiple selection, everything. Cool
Implemented element deleting from element options menu. Also, improved deleting to be handled entirely by the modify module (removed delete.js)
Merge branch 'element-options'

I implemented element modifications triggered from the element options menu.
On the way, I also improved the element modules.
It will, however, need further improvements in the structure.