see earlier checkin for public keys

use in OrderedProperties

in SigUtil.fromJavaKey()
as the class does not define equals().
Affects Android family key loading where the class does not match our class.
Tested via unit test to compare provider class sun.security.util.NamedCurve
to our class java.security.spec.ECParameterSpec, untested on Android.
Add conversion test to CertUtil loadcert CLI.
ref: http://zzz.i2p/topics/3328
ref: i2p.android.base gitlab ticket #47

Was never used; prep for actual usage
Move from router to core
Add Set constructors that are more efficient
Add addUnique() method
Allow size of set passed in constructors
Prepare for extension
javadocs

ref: RFC 2617 sec. 5.2

Change from unchecked to checked exception on unknown keys

for reportAbuse(), disconnected(), and errorOccurred(),
because a single listener may be registered for multiple ports/protocols

for unimplemented ElG import, so CertUtil.loadPrivateKey() will
continue processing and then
fail with the correct exception and error message on bad input.
Pull constant KeySpec out of loop.

to avoid conflict in applications linking to apache jars
As requested by 'mesh' project
Remove with-libhttpclient-java build option
No known external uses other than obsolete i2pcontrol plugin

Remove low-level I2CP reconnector
as it may result in duplicate destinations after
higher-level (i2ptunnel) or application-layer reconnections
Root cause identified by BiglyBT
Gitlab issue #350

one chance in 64K, broken since 2005
don't revert previous attempted fix using synching,
that's still a good idea

Check cert sigs when loading, and log warning on failure

Synch fields in the data messages both directions,
after one report of zero session ID in MessagePayloadMessage
to an external client on fast hardware with Java 18.
Add new constructors for efficiency.
Deprecated setters, unit tests not changed, TODO.
Should fix all the other messages also, TODO.

Rotate the log before we hit the limit, not after

method to efficiently get all types in one pass

Add signedNextInt()

- ChaCha20: Add ivOffset param
- ChaCha20/Poly1305: Add adOffset/adLength params
- Noise: Add XK-SSU2 initializer
- Noise: Add notes about handshake offsets