Shortcuts converts

[arcanis]

Really nice tool! As a workaround for #21 I'm currently reworking all the points (removing extraneous points, turning l into h when they are almost horizontal, etc), but it's a bit heavy on the fingers at the moment. Would you consider adding shortcuts to simplify this? For instance (picked U & I since they seem fairly safe for web applications, are next to each other, and I is a vertical line):

• Ctrl-U: Convert to horizontal
• Ctrl-I: Convert to vertical
• Delete: Remove the selected point

[Yqnn]

Indeed that would be very useful.
I will implement the Deletefor sure.

For the command conversion, I'm wondering if it wouldn't be better to change the behaviour of the existing shortcuts.
Today pressing m inserts a relative move command, and pressing Shift-m inserts an absolute move command (same with l, h, v, c, etc.).
When creating a path, using relative command doesn't really make sense, as it's very hard to manipulate.
Instead we could use m to insert an absolute move command, and Shift-m would convert the selected command to a move command (same with l, h, v, c, etc.)

[Yqnn]

Conversion and Delete shortcuts added.