Merge pull request #1525 from perrito666/master

Improved a little the algoright that resizes the projects tree
lots of improves, signals for settings, session manager working, fixes on locator
Merge pull request #1527 from diegosarmentero/master

lots of improves, signals for settings, session manager working, fixes on locator
Merge pull request #1526 from perrito666/master

Changed the width of the notification qframe
adding working preferences
3.0-ALPHA
Merge pull request #1528 from diegosarmentero/master

3.0-ALPHA
uploading alpha changes
Merge pull request #1529 from diegosarmentero/master

uploading alpha changes
disable plugins
Merge pull request #1531 from diegosarmentero/master

disable plugins
preferences_editor_configuration translated
Merge pull request #1532 from diegosarmentero/master

preferences_editor_configuration translated
preferences editor general translated
Merge pull request #1533 from diegosarmentero/master

preferences editor general translated
adding editor completion configuration and shortcuts
Merge pull request #1534 from diegosarmentero/master

adding editor completion configuration and shortcuts
AlternateRow colors, Placeholder texts, Tooltips with info per file, File extension autocompleter
Fix for QCompleter and Tooltip
Fix for Placeholder text