[Processing] Refactoring of parameters and outputs

It also adds some changes in the core and tools package, to provide a cleaner structure
Add HTML code editor
Switch to QgsCodeEditorHTML for composer html code editor
Add missing HTML editor sip files
[edit widgets] set line edit as read-only instead of disabled
[composer] Switch to using data defined button for picture source expression
Merge pull request #1505 from volaya/master

[Processing] Refactoring of parameters and outputs
Comment sip files for code editor to fix build error on ubuntu
Fix #10909 (SVG markers rendered as images in composer)
Fix build error with processing
indentation update
german translation update
remove automake residuals
debian packaging update with workaround for debian #755491
fix grass64 v.to.points
[FEATURE][composer] Data defined url for composer html items. Sponsored by City of Uster, Switzerland.
Fix build errors
fix qscintilla sip include path (followup 7e815cad)
[Processing] Remove print statements which sometimes cause an exception
[Processing] Add GRASS r.univar and update r.fillnulls