Link compiler and emulator better

[vbmacher]

Debug panel could support a double-click on the instruction with a pointer to a line in the source code editor. The pointers will be valid only after program compilation. On any memory write the pointer at given address will be cleared.

This might have an impact on performance, thus it could be turned off in the configuration file. I think the implementation should be in a memory itself which can hold the pointers. If the support is turned off, more performant memory context implementation can be used instead.