fix(versions): Refactor compare_versions -> Compare-Version

[niheaven]

fix #3329, fix #2981, fix #2720, fix ScoopInstaller/Extras#2106

Now force updating to manifest's version, despite installed version is greater or less than it.

[r15ch13]

More tests:

describe "versions" -Tag 'Scoop' {
    it 'compares versions with integer-string mismatch' {
        compare_versions '1.8.9' '1.8.5-1' | Should -Be 1
    }

    it 'handles plain string version comparison to int version' {
        compare_versions 'latest' '20150405' | Should -Be 1
    }

    it 'handles dashed version components' {
        compare_versions '7.0.4-9' '7.0.4-10' | Should -Be -1
        compare_versions '7.0.4' '7.0.4-9' | Should -Be -1
        compare_versions '7.0.4-9' '7.0.4-10' | Should -Be -1
    }

    it 'handle example comparisons' {
        compare_versions '1' '1.1' | Should -Be -1
        compare_versions '1.0' '1.1' | Should -Be -1
        compare_versions '1.1' '1.0' | Should -Be 1
        compare_versions '1.1' '1' | Should -Be 1
        compare_versions '1.1.1_8' '1.1.1' | Should -Be 1
        compare_versions '1.1.1b' '1.1.1a' | Should -Be 1
        compare_versions '1.1.1a' '1.1.1b' | Should -Be -1
        compare_versions '2019-01-01' '2019-01-02' | Should -Be -1
        compare_versions '2019-01-02' '2019-01-01' | Should -Be 1
        compare_versions '2018-01-01' '2019-01-01' | Should -Be -1
        compare_versions '2019-01-01' '2018-01-01' | Should -Be 1
    }

    it 'handles comparsion against en empty string' {
        compare_versions '7.0.4-9' '' | Should -Be 1
    }

    it 'handles equal versions' {
        compare_versions '12.0' '12.0' | Should -Be 0
        compare_versions '7.0.4-9' '7.0.4-9' | Should -Be 0
    }
}

By checking if $a and $b are equal at the top of compare_versions we can skip the comparison stuff.

    if($a -eq $b) {
        return 0
    }

[r15ch13]

Related issue: ScoopInstaller/Extras#2106

Maybe we could remove the version comparison entirely like @se35710 mentioned.
If the installed version isn't the same as the from the Manifest then it's outdated.

Comparing versions that don't follow a schema like semver.org is pretty much useless anyway. But there are more normal versions then odd ones. See below (includes Main/Extras/Versions and outdated Java/PHP/NerdFonts buckets):

Normal version numbers:

X:\~projects\~powershell
λ (Get-ChildItem *\bucket\*.json -Recurse | % { (Get-Content $_ | ConvertFrom-Json).version } | ? { $_ -match "^[\d.]+$" }).Count
1181

Odd versions with other symbols then 0-9 and .

X:\~projects\~powershell
λ (Get-ChildItem *\bucket\*.json -Recurse | % { (Get-Content $_ | ConvertFrom-Json).version } | ? { $_ -notmatch "^[\d.]+$" }).Count
224

[niheaven]

@r15ch13 Please consider merge this PR, mupdf update from 1.16.0-rc2 to 1.16.0 but scoop cannot update it excepts with -f...

[xfournet]

Could you add the following test ? (see shovel-org/Windows-JetBrains-Bucket#11)

    it 'handles unbalanced versions' {
        Compare-Version '2019.2.1-192.6262.58' '2019.2-192.5728.98' | Should -Be -1
    }