Pharo 10 compatibility

It fixes the reflective code for the lock flag variable updating to be Pharo 10 compatible.

Fixed to Pharo 7/8/9 compatibility

ReadWriteLockTests >> testFailedReadShouldUnblockWrite
ReadWriteLockTests >> testFailedWriteShouldUnblockRead

• BlockClosure #ifError was deprecated on Pharo 9.
• I'm using "(BlockClosure canUnderstand: #onErrorDo:) ifTrue: ifFalse:" to keep compatibility.

ReadWriteLockTests >> testTerminatingReadWhichWaitingWriteAndAnotherRead
ReadWriteLockTests >> testTerminatingWriteWhichWaitingAnotherTwoWrites
By @MarcusDenker:

• When the process is terminating, it calls: #handleProcessTerminationOfWaitingContext:
• Due to the "full blocks" in Pharo9, "suspendedContext method" is not that method, but the method of the block (the "compiledBlock")
• So I change that to "suspendedContext home method pragmas do: "
• It was using "pragma keyword ", but that is old, it is "selector" now

Migration to Tonel

• migration to Tonel
• drop Pharo 6.0 support

Remove dependency to StateSpecs

Now assert: is used in tests instead of should

Fix for locked process termination logic

There was incorrect behaviour when read process locked by write was terminated.

Also this version includes better stable tests

moved from smalltalkhub

package named according convention