Fix current deprecation warnings as of capnproto-1.0.1 #88

1. 
   ryanofsky commented at 8:04 pm on November 17, 2023: collaborator

   This drops compatibility with capnproto versions before 0.7.0 and also adds a hard dependency on the kj/filesystem.h library which was previously optional

   Fixes #87 and #39

2. Remove deprecated kj::mvCapture calls to avoid warnings

   There's no downside to this change since c++17 is already required.
   
   Fixes #87

   e8e89dfd37
3. mpgen: Avoid deprecated SchemaParser::parseDiskFile call

   This avoids deprecation warnings, and is potentially a little safer since it
   sandboxes the parsing and makes it an error to import paths outside the source
   directory.
   
   This change does have some downsides, though. It complicates include logic, and
   also drops compatibility with capnproto versions before 0.7.0 that don't have
   the new SchemaParser::parseFromDirectory method which was added in
   https://github.com/capnproto/capnproto/commit/c1fe2b0339a1499c354eb85a2a78c63b2ce449f3
   It also adds a hard dependency on the kj/filesystem.h library which was
   previously optional.
   
   Fixes #39

   962e681356
4. ryanofsky merged this on Nov 17, 2023
5. ryanofsky closed this on Nov 17, 2023

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ryanofsky