This allows us to set `locked` to a value greater than `1` to lock a factoid WITHOUT
allowing invocation of `required_caps` commands. This lets us safely lock a factoid
that has unrestrained `$args` or variables.
As a security measure to prevent users from creating or modifying factoids to
sneak in commands to trick chanops/admins/botowners/etc into executing those
commands, the command interpreter will now check if the command has been
invoked in the context of a factoid. If so, the factoid must be locked.
PBot now preserves whitespace by default. The `preserve_whitespace`
metadata field is now redundant. It has now been replaced with
`condense-whitespace`, which when set to a true value will collapse
adjacent whitespace to a single space.
general.debugcontext: filter out cmdlist and arglist
Core/Applets: log applet start/stop and duration
Core/ProcessManager: fix potential race-condition with $context object
Core/Interpreter:
* expand pronouns before command-substitution
* attempt to find current channel's factoid instance for metadata
* remove duplication of command history in command-substition
* terminate pipe/substitution processing when protecting self
Core/Factoids: limit -url contents to 250kb
