Various cleanups

[Menduist]

Some groundwork for V1:

• Mount PushIdentify by default in newStandardSwitch
• Try to remove as much exported procs & fields as possible
• Remove raise without explicit exception (should be raise exc)
• Check that we don't try to catch RangeError (or other defects)
• Remove the need for stdlib random
• Check the new/init procs
• Remove deprecated procs
• Fix compilation warnings
• Try to lower the recursive dependency count as low as possible

[arnetheduck]

Mount PushIdentify by default in newStandardSwitch

we've avoided any strictly unnecessary protocols so as to reduce the security surface area and information leaks in the "default" setup - by not having them enabled, users of libp2p are made aware of each protocol that they're enabling so they can analyze its usefulness for their application - eth2 for example likely shouldn't have it enabled

[Menduist]

Done except the Push Identify