Shader Editor context menu and line operations and style fix #12842
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Improvements and fixes to Shader Editor
fixes #12702 and #12910
fixes multiple errors being highlighted, as mentioned in #11613
adds line edit operations to menu with shortcuts for
EDIT_MOVE_LINE_UP, EDIT_MOVE_LINE_DOWN, EDIT_INDENT_LEFT, EDIT_INDENT_RIGHT, EDIT_DELETE_LINE, EDIT_CLONE_DOWN, EDIT_TOGGLE_COMMENT, EDIT_COMPLETE.
These were copied from script_text_editor.cppcontext-sensitive context menu (eg. can only copy when text is selected).
fixes style of shader editor to be more similar to the script editor.
also moves swap_lines from script_text_editor.cpp to text_edit.cpp