refactor: use upstream readline library

[TorchedSammy]

use the upstream readline library to bring in the changes and added features. this removed the in-repo readline lib as well since it wont be needed.

• [x] set input mode from hilbish
• [ ] reimplement functions for editor interface
• [x] prompt
• [ ] completions (partially done)
• [ ] raw input hook
• [ ] history (not even sure if this works atm)
• [ ] vim hooks
  • [ ] vim actions
  • [ ] vim mode
• [x] use a fork?
• [ ] check for regressions
  • [ ] bug fix regressions (report upstream or fix on fork)
  • [ ] 8d40179a73fe5942707cd43f9c0463dee53eedd8
  • [ ] 4ee160fb664907b0ad405d1f461831a508ad4053
  • [ ] d6338fc021f56ee5a58f1d5ca5d93b958eba2dbd
  • [ ] 3eaeb6a5da169925fe748c096ac3069c3cb97b00
  • [ ] 1febe66f846f500f4bd07fe14691e3b359f49c80
  • [ ] b4ca5bfda378d2029e72942b1cc74dff7f00656d
  • [ ] 308e2578722d61d236508a35b60a744f18ab4b39
  • [ ] a1ce2ecba683589851aa2f3c6684824c67f52e87
  • [ ] 387d7d2243c1378ccd59fb77e7dd767870feb662
  • [ ] 7e57b3de7d9ca4bcbef0adf89ef098a268b2f5ef
  • [ ] 3196f0dcb93c1de089e6681553d822f6a98c45ce
  • [ ] 2faaf4e045c680f039596295f1ffd8efa3f83d1c
  • [ ] 6ccb9ebeff19b212c2389875b3774578e0ffec4e
  • [ ] 1e48a3e03d734a09ccf2993c8409e5e5dc64cad3 (atm seems home/end doesnt work - report upstream)
  • [ ] bee8d6e9e6b6800218ab5083ae2d6bffda41d209
  • [ ] 48cb62282d4e96dcee72f1a0e734ecbe50c659ec
  • [ ] 194e4e01b78f67244485a4ffceb0915fe81ead0c
  • [ ] c342f4f6f5f820fca228b9d92173c4e92ac53ee0
  • [ ] 52caedc1f1fed8507c6e986f02d6a3e771537347
  • [ ] 20fae8a8709773ccab90e1af8f9fd5b3e8f99ddc
  • [ ] 577f00dfef9d665a7429bdb0b55b0d9701f267f7
  • [ ] 722bd1cd80cd49e9350c7973c85758897d3f111e
  • [ ] f27d60f8277d54ac9cebd3bdfbbff29d35663ab5
  • [ ] 0ee47cc6f0778982971a2905537a1d592efb41d2
  • [ ] ae449b89ebafc7cffb98ebfd9b9843777e1e73f3
  • [ ] 5e505d0a8d5c51cd8b42f01da641ac2189869d17
  • [ ] 91222f9d747c7dea2bd43a550db530a01ad0c5c7
  • [ ] 0113a4e0b45675106b5c9028c1a0512963173671
  • [ ] feature regressions (reimplement in fork or suggest upstream)
  • [ ] bd4e0df7b32e43115ae307d7ff7b9ab0c8da3b11
  • [ ] 7f161e668319deb75f6a3959dea790d8fad2ce9e
  • [ ] 194e4e01b78f67244485a4ffceb0915fe81ead0c
  • [ ] 1715a1f626cb441a7a8e50c3aeeaaecb5db4ca21
  • [ ] 7f161e668319deb75f6a3959dea790d8fad2ce9e
  • [ ] 0ebd8d9035083e7a290a620af8ba444f0ac0b006
  • [ ] 61c9e12a4af59fcdd5f7f9b746966febd6111d60
  • [ ] 6ea25a22b3a1d59b2fd640894ede364523edd689 (do we have both hints/info text and inline hints?)

[TorchedSammy]

^ i dont know when the new version will be good/usable (for our uses anyway) so dont pin on a specific release

[TorchedSammy]

upstream has gone silent again and since there are a bunch of annyoing bugs and changes i dont like im not gonna pursue with this anymore