efl_text_formatter: rename from Efl.Text.Formatter to Efl.Text_Formatter

this is needed in order to not collide with the Efl.Text Interface.
Theoretically eolian should have ordered on that, however, the checks
are buggy and only work out of tree.

ref T8648

Reviewed-by: Xavi Artigas <xavierartigas@yahoo.es>
Differential Revision: https://phab.enlightenment.org/D11662

src/lib/evas/canvas/efl_text_formatter.eo

@@ -1,6 +1,6 @@
 import efl_text_types;
 
-abstract Efl.Text.Formatter extends Efl.Object {
+abstract Efl.Text_Formatter extends Efl.Object {
     [[Text Formatter API to manage text formatting(attributes).
      Use it to insert and remove style attributes (font, size, color, ...) using @Efl.Text.Cursor on EFL Widgets.