BBCBasic

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Added array slicing, using the syntax: array(first TO [last]) or array(row, first TO [last]).
Compound assignment and array arithmetic now accept the exponentiation operator ^.
By default, PRINT~ and STR$~ report an error if the value cannot be expressed as 32-bit hex.
Updated gfxlib.bbc to add PROC_gfxInvert, PROC_gfxPlotScaleDissolve and PROC_gfxPlotScaleAlphaBlend.
Added filters.bbc, soccerball.bbc, spinmaze.bbc, bauble.bbc and belier.bbc example programs.