Speed up drawing image into fresh context #1
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This implements improvement 1 discussed in issue tidbyt/pixlet#350.
I made the graphics context keep track of its freshness, and use draw.Src for drawing images in case the context is clean so far. This way, no changes to pixlet are needed other than the dependency change.
Please note the pixlet render speedup only affects applets that involve heavy image drawing, but it is considerable for those. This change speeds up the reddit_r_place community applet by a factor of 3 on the Raspberry Pi Zero.