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Canvas gets several new calls: `setLinePattern` accepts a LinePattern object for setting a pattern a line can optionally use `setLinePatternLength` allows the length of the line pattern to be set `setLinePatternOffset` allows the offset within the pattern to be adjusted `setLineOptions` sets whether a line should be drawn as a dotted line, and whether its first and/or last points should be omitted BitmappedDisplayController’s `PaintState` object now includes `linePattern`, `lineOptions` and `linePatternLength`. `genericAbsDrawLine` now looks at the `lineOptions` in the current paint state to determine whether a dotted line should be drawn, and whether first or last points should be omitted fabutils gains a `getBit` function which will get a bit at an index within an array of uint8_t numbers. the position is in “most significant bit” order, i.e. bitIndex 0 is the bit representing 128 in the first byte in the array
basic arc support for all screen depths NB there is no compensation in these for non-square pixel modes, i.e. the circle that arc follows assumes squareness
adds the ability to draw filled segments builds on work to draw arcs
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Adds support for drawing arcs, filled segments and filled sectors
Parameters for these functions essentially match the style of Acorn's equivalent PLOT calls
also includes code from #39
for clarity of the git commit history I'd recommend merging using a merge commit rather than using a "squash". the commits in this PR individually add functionality for each new feature