[WIP] fixes #112; alt design to #101 using inheritance instead of global vars

[nayr7]

fixes https://github.com/krisppurg/dimscord/issues/112; alternative to https://github.com/krisppurg/dimscord/pull/101 using inheritance to allow referencing the current state of the user's RestApi from inside the library; is also likely to integrate well with the current design of https://github.com/krisppurg/dimscord/pull/110

important info/considerations:

• the implementation relies on objects from the cache table to reliably populate the ctx field, it will be nil if it didn't !
• consider relying on compile time mechanisms to ensure any DimscordObject object that return from procedures do not have a nil field.
• it must be decided whether to make DimscordObject.ctx a public or private field for safety reasons

tasks:

• [ ] port helping procs from https://github.com/krisppurg/dimscord/pull/101 to this pr
• [ ] ensure that DimscordObject.ctx is properly populated for every objects

[krisppurg]

may I ask why make a new PR when you could just rewrite the original PR instead?

[nayr7]

I keep the other PR around for now in case I can fix/improve it, alongside a less messy git history in case https://github.com/krisppurg/dimscord/pull/101 is to be discarded in favor of this one