Latin Extended-B character width edits

1. Adjusted widths of capital letters with hooks and throughstrokes
(ƁƇƊƏƑƓƖƗƠƤƬƮƯƳ) and some small letters with hooks and throughstrokes
(ƈƒƚƴ)

2. Recreated Ɔ, by taking a turned C, changing the serifs to match with
capital Ezh, and sdjusting the curve to match the right half of O. Now
it actually looks like an open O!

3. Fixed the hook on ƈ, which looked way too heavy, by modelling it on
the hook of Ƈ.

4. Started fixing U+01BE, which according to the Unicode specification
is supposed to be a "ligation of t and s" (since it was formerly used
to represent the affricate [ts]).
Further Latin Extended-B modifications

1. Remodelled upper serif of open O on that of capital Yogh

2. Thickened tail of ezh-with-tail for better consistency

3. Recreated U+01BE as a ligation of t and s (as per Unicode
specification)

4. Moved accent marks on I with caron, u with umlaut and macron, a with
umlaut and macron, k with caron, I with inverted breve, and h with caron

5. Adjusted bearings of capital Hwair (so that it doesn't collide with
following letter)

6. Adjusted leg on "capital N with leg", so that it extends all the way
to the bottom of the descender space