Tdewolff-minify

- JS: only put `var` declaration into `for` or `while`, and not `let` nor `const`, fixes 325
- JS: merge more efficiently a `var` declaration with a `for` or `while` statement

- JS: fix parsing `in` identifier in group expressions
- JS: fix parsing identifiers inside arrow function body in some cases 324
- JS: keep all license comments at the top of the file
- JS: minify `typeof x==='undefined'` to `typeof x=='undefined'`
- JS: merge expressions and var declarations with `for` with empty initializer or with `while` statement converted to `for`
- JS: iteratively merge `if(a){return b}if(c){return d}return e` chains to `return a?b:c?d:e`

- **Add JS (ECMAScript 2020) minifier**
- Improve benchmark functions
- Predefine byte-slices instead of inline for performance
- Don't check write errors to output during minification, but check at the end only
- Lexers/parser now require passing `parse.Input` instead of `io.Reader`
- Rename subpackage `min` to `minify`

JS minifier overview
Features:
- remove superfluous whitespace
- remove superfluous semicolons
- shorten `true`, `false`, and `undefined` to `!0`, `!1` and `void 0`
- rename variables and functions to shorter names (not in global scope)
- move `var` declarations to the top of the global/function scope (if more than one)
- collapse `if`/`else` statements to expressions
- minify conditional expressions to simpler ones
- merge sequential expression statements to one, including into `return` and `throw`
- remove superfluous grouping in expressions
- shorten or remove string escapes
- convert object key or index expression from string to identifier or decimal
- merge concatenated strings
- rewrite numbers (binary, octal, decimal, hexadecimal) to shorter representations

It compresses files at about 25 MB/s (only minifying, not considering reading/writing files) which is (much) faster than existing minifiers. Compression rate is between 1.5 and 3.0 depending on the file (respectively, the compression file size is between 35% -- 65% of the original). Example of known files:

| File | Original Size | Compressed Size | Ratio | Time | Speed |
| --- | --- | --- | --- | --- | --- |
| ace.js | 644 kB | 346 kB | 53.7% | 34ms | 19 MB/s |
| dot.js | 5.2 kB | 3.3 kB | 64.9% | 563µs | 9.2 MB/s |
| jquery.js | 247 kB | 85 kB | 34.4% | 11ms | 22 MB/s |
| jqueryui.js | 470 kB | 241 kB | 51.3% | 26ms | 18 MB/s |
| moment.js | 99 kB | 35 kB | 34.9% | 4ms | 24 MB/s |

The minifier has been tested for a number of web applications including WordPress. The `go-fuzz` fuzzer has been used extensively in order to detect bugs, and will continue finding bugs using https://github.com/google/oss-fuzz

**WARNING** for package maintainers, some **files have been renamed**, adjust your build scripts accordingly.

- Use Makefile instead of GoReleaser to build releases for all architectures, use `make release`. This fixes the `README.md` file location inside the archives to be in the root of the archive
- Release archives will no longer have the version name explicitly stated, fixes 316
- Remove `cmd/minify/install.sh`, use `make install` instead
- Rename `cmd/minify/minify_bash_tab_completion` to `cmd/minify/bash_completion`
- Rename `LICENSE.md` to `LICENSE` as it is not a Markdown file
- Rename `min` subpackage to `minify`
- cmd: running `minify` without arguments will print a more informative error message
- cmd: bad arguments will not display cmd usage automatically

- cmd: fix file paths on Windows when input and output directories are equal (slash vs backslash)
- cmd: add `--cpuprofile` and `--memprofile` options
- cmd: fix usage of `--match` and `--sync` simultaneously, fixes 315
- cmd: `--match` applies to all filename inputs not just under directories
- CSS: remove whitespace around custom variable value, fixes 305
- JSON: minify numbers, fixes 302
- HTML: fix slow parsing of `<a>` tag with many `name` or `id` attributes (OSS-Fuzz)
- Don't replace space by `+` in DataURI, fixes 314
- Don't escape ` : ; = ? + , / $ \t \n \r` in DataURIs (works for Chrome, Firefox, Opera, Edge, Safari, Yandex, and IE9, IE10, IE11)

- HTML: remove text and whitespace within `select` and `optgroup` tags
- CSS: fix slow parsing of selectors when they contain many errors (OSS-Fuzz)
- CSS: fix RGB/HSL when a parameter overflows (OSS-Fuzz)
- CSS: fix slow parsing of large HSL parameters (OSS-Fuzz)
- cmd: properly run defer calls after command ends, may fix some race bugs
- Add easy API in the `min/` subpackage
- Add project to OSS-Fuzz