Printing: add TemplateEdit form to source tree

The TemplateEdit class works to customize the tempalate before printing,
User can select the font-size, font-type, color-palette, linespacing
and editing the template HTML code.

Signed-off-by: Gehad elrobey <gehadelrobey@gmail.com>
Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>

CMakeLists.txt

@@ -118,6 +118,7 @@ else()
 	set(SUBSURFACE_PRINTING_SRCS
 		printer.cpp
 		templatelayout.cpp
+		qt-ui/templateedit.cpp
 	)
 	set(PRINTING_PKG PrintSupport)
 	set(PRINTING_LIB Qt5::PrintSupport)