More cleanups and stuff. May need to be split up.

xcbuild doesn’t work exactly like xcode in some ways.

Lots of reworking here. May need to be split up.

Here I document setup hooks provided by:

- cmake
- xcbuildHook
- meson
- ninja
- unzip
- wafHook
- scons

This seems like a useful thing to document

This makes more sense in context.

vimPlugins.vim-ps1: init at 2017-10-20

isl: add 0.20

Semi-automatic update generated by
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based on information from
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granite: 5.2.0 -> 5.2.1

gitHUD: renamed to githud

nodePackages.phantomjs: remove override

gmsh: 4.0.4 -> 4.0.5

a left-over from https://github.com/NixOS/nixpkgs/pull/50451

Manually updated

Update `isl` to use `isl_0_20`.

Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
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Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
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Fix typo in nixpkgs manual

jruby: 9.2.1.0 -> 9.2.4.0

linuxPackages.{spl,zfs}: 0.7.11 -> 0.7.12

Semi-automatic update generated by
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pulseeffects: 4.3.9 -> 4.4.0

mtools: 4.0.19 -> 4.0.20

Semi-automatic update generated by
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Fixes #49883

neo4j: 3.4.9 -> 3.4.10

Update jflex urls, and version by the way

protozero: 1.6.3 -> 1.6.4

jid: init at 0.7.2