Add support for custom pagers, e.g. Delta#1593

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stevenxxiu wants to merge 10 commits intoNeogitOrg:masterfrom stevenxxiu:feat/custom-pager

Commits on Jan 10, 2025

feat: support viewing the diff via other pagers, e.g. *Delta*
stevenxxiu
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refactor: ANSI colorize continuous chunks at once
stevenxxiu
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docs: add *Delta* example for log_pager
stevenxxiu
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docs: for *Delta*, hyperlinks must be disabled in its *Git* config section
stevenxxiu
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refactor: use vim.system() instead of *plenary* to run config.values.log_pager
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refactor: run the pager in neogit.lib.git.diff build_pager_contents()
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refactor: move Buffer:set_line_highlights() ANSI highlights to Buffer:set_ansi_highlights(), to avoid finding hunk line numbers manually with the hard-coded NeogitDiffContext
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feat: handle "Erase in Line"
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docs: switch from * to , as help documents treat that as a tag
stevenxxiu
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test: add pager_contents to subject.parse() specs
stevenxxiu
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