Add an option to allow score input

[Sophira]

Because the pause time is based on the in-game time bonus score countdown, it should be possible to enter either the in-game time or the score itself. Having the score be able to be entered would also allow the other classic Sonic games to be supported before issue #4 is resolved, as they all count down 100 points per frame.

[Sophira]

I'm likely to implement this as an option in the settings screen.

It's been requested that for score input, there could be buttons that could be clicked for score input instead of using the keyboard, but my feeling is that that's likely to result in more mistakes from clicking the wrong button. At first this will probably be done using text input, hopefully with some sort of autocomplete (favouring higher scores, so "10000" would be autocompleted when entering "1", rather than "100" - this is a speedrun tool after all). Care would need to be taken to still allow input of the lower scores, though.

[Sophira]

I've made a start at adding this feature. Right now locally the points input is simply a text box like it is for IGT input; this is basically the bare minimum needed for this issue, but I'd like to do more with it at some point.

For that reason I won't be closing this issue when the 'bare minimum' version is released; instead I'd like to keep it open for additional work on it.

[Sophira]

Release 0.7 now has the points entry feature, with a setting to allow entered points values to be multiplied by a given factor to save on typing.

I still think it can go better, so I'll leave this open for now.