Modification of some Debug Modules parameters into (static) signals, as part of (#269)

[cairo-caplan]

Modification of some Debug Modules parameters into (static) signals, as part of the task to
uniformize the CVE2 interface IO with the CVE4, #269 In summary:

• The Debug halt and exception addresses were transformed from parameters (DmHaltAddr, DmExceptionAddr) into signals (dm_halt_addr_i, dm_exception_addr_i) , matching their equivalents on the CVE4
• DbgTriggerEn was kept, but a reference comment to CVE4's DbgTriggerEn
• DbgHwBreakNum, the number of hardware breakpoints supported, has no equivalent on the CVE4, so I kept it.

Additionally:

• Added a buildsim.log to the gitignore, as it was generated by some make targets
• Modified the reference from the IBEX to CVE2 on some comments of the already modified files, when necessary.
• This PR includes the commit to extend the Performance counters from 0 to 10, part of Change the default to 10 performance counters #214