Refactor/backmp11: Various topics

[chandryan]

Applied refactorings:

• Replaced remaining occurrences of HandledEnum with process_result
• Added bit operations for process_result for better readability
• Replaced the process_event callback "ping-pong" with a normalize_event function for better readability
• Removed the MSVC workaround in the dispatch table generation of the favor_runtime_speed policy, as MSVC seems to be able to handle the optimized way after the fix of event deferral was applied
• refactored remaining MPL usages to Mp11 in favor_runtime_speed
• refactored state generation to work more directly without adding not real rows
• first contents specific to transition tables in the backend moved to separate header
• reduced the amount of eager unneeded template instantiations to reduce mostly RAM usage but also a little bit of compile time
• improved the visitor implementation to accept multiple predicates, that are processed sequentially (needed to reduce compile time overheads when checking for deferred events)