Main function detection improvements

[xusheng6]

Now that we have main function detection for x64 PE files, there are a few improvements that we should add:

• Detect main function for x86 PE files
• Differentiate main/wmain/WinMain/wWinMain, and apply the prototype of the function (instead of only the name of the function)
• Add a binary data notification for "main function detected", and use that as the mechanism for navigating to the main symbol
• Detect DllMain/DriverEntry
• Detect main function for debug builds
• Detect main function for compilers other than MSVC
• Handle conflicts with existing symbols (e.g., from PDB)

Related to #4601

[op2786]

Does this improvements include DllMain detection?

[xusheng6]

Does this improvements include DllMain detection?

Not yet, I should add it to the list

[xusheng6]

For DllMain, we should also consider setting UIDF on the first parameter to the value of bv.start

This can be helpful in cases like https://youtu.be/kgyRiQqc1FU?feature=shared&t=549, where the code adds some offset to the 1st argument to get a pointer to somewhere within the DLL