Analyze CPU Timing doesn't work with NES `*.c` files

[fredsa]

Use the "Analyze CPU Timing" button with these NES projects:

DASM timing is displayed correctly:

• https://8bitworkshop.com/v3.12.1/?platform=nes&file=road.dasm

C timing is not displayed:

• https://8bitworkshop.com/v3.12.1/?platform=nes&file=chase%2Fgame.c
• https://8bitworkshop.com/v3.12.1/?platform=nes&file=shoot2.c
• …

Investigating, it appears that setTimingResult in editors.ts has correct offsets in this.sourcefile.line2offset, but the computed CPU timing is stored with incorrect offsets in result.pc2clockrange.

The incorrect offsets can also be seen in the developer console, logged by for exampleanalysis.ts:179.

[sehugg]

Timing analysis is difficult with C projects because it has to wind its way through startup code. This feature on the NES is only useful with certain cycle-sensitive display code, so maybe it should be disabled for C programs which don't have this kind of code