Musicxml import fix todo's ws

[lvinken]

Resolves:
https://musescore.org/en/node/300542
https://musescore.org/en/node/301113

Fix old regressions in file mscore/importmxmlpass1.cpp marked with "TODO WS". Leftovers from Werner's migrations in early 2017. Restores the import from MusicXML of word font and page size and margins.

• I signed CLA
• I made sure the code in the PR follows the coding rules
• I made sure the code compiles on my machine
• I made sure there are no unnecessary changes in the code
• I made sure the title of the PR reflects the core meaning of the issue you are solving
• I made sure the commit message(s) contain a description and answer the question "Why do those changes fix that particular issue?" or "Why are those changes really necessary as improvements?"
• I made sure the commit message title starts with "fix #424242:" if there is a related issue
• I created the test (mtest, vtest, script test) to verify the changes I made