Prefer application/x-ole-storage instead of application/x-tika-msoffice

[gmcgibbon]

Closes #44

Prefer application/x-ole-storage as a fallback for ms-office documents. This was the behaviour of Marcel 0.33.

However, I'm resorting to this because I can't find a good magic matcher to identify *.olf files. The header of the binary file is already used to identify it is an OLE/office type file, and there doesn't appear to be (AFAICS) any bytes we can read at a consistent offset to denote application/vnd.ms-outlook.

The more specific matching matchers for office subtypes appear to be very subtle though. For example, the one we use for application/msword:

marcel/data/custom.xml

Lines 13 to 17 in 85c2559

	<magic priority="50">
	<match value="0xd0cf11e0a1b11ae1" type="string" offset="0:8">
	<match value="jbjb" type="string" offset="546" />
	<match value="bjbj" type="string" offset="546" />
	</match>

Regardless, I think we can agree that x-tika-msoffice was supposed to be an internal type grouping that shouldn't be surfaced in mime type detection.

[pixeltrix]

@gmcgibbon I'll leave these for you to merge after approval so you can manage any conflicts that may arise.