Merge pull request #82 from babs/code-refactoring-trans-fr

Resolved shortcut conflict on French translation.
Introduced a new feature: Pressing F2 on selected object it will be
quickly renamed. (issue #81)

Fixed a bug when renamed schemas the pgsql types were not updated.

Made some widget size adjustments.
Merge branch 'code-refactoring' of https://github.com/pgmodeler/pgmodeler into code-refactoring
Finish the quick actions implementation. (issue #81)
Features available on this commit: Rename, Move to schema, Change owner,
Edit permissions.
Change on "objects of model", when updating it the tree do not collapses
keep the items expanded. (issue #83)

Fix the selection on "objects of model", now selected item has the
correctly action / shortcuts configured. (issue #84)
Change on Object of Model widget when picking a object, now all nodes
are expanded by default. (issue #71)
Class and form ObjetoBaseWiget renamed to BaseObjectWidget
BaseObjectWidget class refactoring checkpoint. Pending comment
translation.
Version update alpha2 -> beta.
CHANGELOG.md and PLUGINS.md updated.
Fixed an incorrect reference to output stream on windows system.
Update on CHANGLOG.md and README.md
BaseObjectWidget class refactoring checkpoint. Pending .cpp file comment
translation.
BaseObjectWidget class refactoring done.
BancoDadosWidget refactored to DatabaseWidget.
Class CaixaMensagem refactored to MessageBox.