Bring back the terminal backend to life. #210
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It renames 'CursesBackend' to TermKit, as now TermKit has various console drivers, and curses is just one of them. The challenge is that TermKit deals with screen sizes like 80x24, not things like 600x400, so both the default sizes and spacing in the codebase will need to compensate for that. The AppBackend introduces a defaultStackSpacingAmount which is the spacing that VStack and HStack would use, it is currently kept as a default to the existing value, but for the TermKit backend, this value is set to zero. Now HStack and VStack rather than storing a resolved value like 'spacing: Int', they store the request 'spacing: Int?', which is resolved before it is actually needed by querying the backend for this data. There is also a new 'limitScreenBounds' that is a no-op for most, but on the curses cases, ensures that a misuse of the defaultSize does not trickle up and down the stack with unrealistic view sizes.
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It renames 'CursesBackend' to TermKit, as now TermKit has various console drivers, and curses is just one of them.
The challenge is that TermKit deals with screen sizes like 80x24, not things like 600x400, so both the default sizes and spacing in the codebase will need to compensate for that.
The AppBackend introduces a defaultStackSpacingAmount which is the spacing that VStack and HStack would use, it is currently kept as a default to the existing value, but for the TermKit backend, this value is set to zero.
Now HStack and VStack rather than storing a resolved value like 'spacing: Int', they store the request 'spacing: Int?', which is resolved before it is actually needed by querying the backend for this data.
There is also a new 'limitScreenBounds' that is a no-op for most, but on the curses cases, ensures that a misuse of the defaultSize does not trickle up and down the stack with unrealistic view sizes.