Should help with eventual testing

Reorganizes local git support to exclude from web
Swaps sha1 usages to md5 to avoid needing sha1 on the web (md5 is required by Gravatar)
Avoids crypto-browserfy and imports md5.js directly
Uses platform crypto for random nonce strings

Removes Show Here/Show in Side Bar toggle from search git command
Changes showResultsInSideBar to be an override if not null

Renames show commit in view to search for commit in side bar

Closes #410 - adds ability to search by multiple criteria
Adds ability to match case, match all, & use regex

Giving up on better else/catch/finally formatting -- can't fight anymore
Switching to tabs for better accessibility
https://twitter.com/sh4na/status/1146837957200027648

Causes too much confusion vs -G which better matches user expectations

Remembers and restores the last commit search string
Adds search command to the results inline toolbar
Reopens search when clicking on a result node with no results
Fixes encoded html in empty state

Changes commit search by message to be case-insensitive
Clarifies path/glob for file searches

Adds search commits button to view

Updates README (wip)
Updates welcome & settings pages (wip)

Renames showCommitInResults to showCommitInView
Renames showFileHistoryInResults to showFileHistoryInView

Adds @command decorator
Changes (fetch|pull|push)All to be cancelable

Renames path to paths
Reworks sha regex & methods

See https://github.com/Microsoft/vscode/pull/46102

Adds repo name to results if there is more than 1

Adds new getLogCommit
Adds getRecentLogCommitForFile
Renames getLogForRepo to getLog
Renames getLogForRepoSearch to getLogForSearch

Adds a static "container"
Adds a document tracker - replaces the context tracker
Adds a line tracker
Refactors all the things - better performance, lower overhead, less code, more separation of concerns, more maintainable (hopefully)
Changes dirty blame to only happen after a "idle" delay
Closes open file annotations on edit (too expensive to track changes)

Adds file-based search options to placeholder text