Various fixes and improvements to latching behavior

changes/api/+latches-sometimes-break-other-latches.breaking.md

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+Changed latching behavior so that latching a modifier or group now breaks existing modifier latches,
+but only if the type of the key responsible for the latter latch
+has the modifier of the pre-existing latch in its modifiers list,
+and did not `preserve` the modifier.
+
+For example, if a new latch is triggered by pressing a key of type `ALPHABETIC`,
+existing `Shift` and `Lock` latches will now be broken, but other latches
+will be preserved as before.

changes/api/+locks-break-latches.breaking.md

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+Changed modifier and group latches so that setting or releasing a lock now breaks them.
+(This includes setting a lock via `latchToLock`, or clearing it via `clearLocks`.)
+This enables implementing a key that, for example, latches `Shift`
+when pressed once, but locks `Caps` when pressed twice in succession.

changes/api/+multiple-simultaneous-latches.breaking.md

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+Changed latching behavior so that the same rules used to detect
+whether an action breaks a latch after the latching key is released,
+are now also used to detect whether the action prevents the latch
+from forming before the latching key is released.
+
+The major effect of this change is that depressing and releasing
+two latching keys simultaneously will now activate both latches.