the patch panel would crash if the filename contained an odd number of double quotes

[Ryooooooga]

1. Fix crash when filename contains double quotes (#1433)

The error with spaces in the file name is fixed in #1433, but the job is not perfect.

The patch panel crashes when the filename contains an odd number of double quotes.

error log

Press enter to return to lazygit
panic: Starting quote has no ending quote.

goroutine 1 [running]:
github.com/mgutz/str.ToArgv(0xc0006746e0, 0x97, 0x1696bc0, 0xc000893e20, 0x1696bc0)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/vendor/github.com/mgutz/str/funcsPZ.go:377 +0x5d9
github.com/jesseduffield/lazygit/pkg/commands/oscommands.(*OSCommand).ExecutableFromString(0xc00007d680, 0xc0006746e0, 0x97, 0xc0005df000)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/commands/oscommands/os.go:195 +0x39
github.com/jesseduffield/lazygit/pkg/gui.(*Gui).handleCommitFileSelect(0xc0001a8000, 0xc0001b6138, 0x17b2df8)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/gui/commit_files_panel.go:45 +0x16e
github.com/jesseduffield/lazygit/pkg/gui.(*ListContext).HandleFocus(0xc0001a6230, 0xc000785980, 0xb)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/gui/list_context.go:96 +0x178
github.com/jesseduffield/lazygit/pkg/gui.(*Gui).activateContext(0xc0001a8000, 0x1866b38, 0xc0001a6230, 0x0, 0x0)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/gui/context.go:248 +0x309
github.com/jesseduffield/lazygit/pkg/gui.(*Gui).pushContextDirect(0xc0001a8000, 0x1866b38, 0xc0001a6230, 0x1beae20, 0xc0006f2180)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/gui/context.go:117 +0x1f6
github.com/jesseduffield/lazygit/pkg/gui.(*Gui).pushContext.func1(0xc0001b6000, 0xc00038b7c0, 0x0)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/gui/context.go:86 +0x3c
github.com/jesseduffield/gocui.(*Gui).consumeevents(0xc0001b6000, 0x0, 0x0)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/vendor/github.com/jesseduffield/gocui/gui.go:637 +0x1a2
github.com/jesseduffield/gocui.(*Gui).MainLoop(0xc0001b6000, 0xc000000004, 0xc000561a08)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/vendor/github.com/jesseduffield/gocui/gui.go:619 +0x1ec
github.com/jesseduffield/lazygit/pkg/gui.(*Gui).Run(0xc0001a8000, 0x0, 0x0)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/gui/gui.go:540 +0x51b
github.com/jesseduffield/lazygit/pkg/gui.(*Gui).RunAndHandleError.func1(0xc000256001, 0xc0001b4000)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/gui/gui.go:548 +0x45
github.com/jesseduffield/lazygit/pkg/utils.SafeWithError(0xc00029fb40, 0x0, 0x0)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/utils/utils.go:118 +0x62
github.com/jesseduffield/lazygit/pkg/gui.(*Gui).RunAndHandleError(0xc0001a8000, 0x0, 0x1784295)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/gui/gui.go:547 +0x7d
github.com/jesseduffield/lazygit/pkg/app.(*App).Run(0xc00025ea10, 0xc00011c7e0, 0x0)
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/pkg/app/app.go:242 +0x6b
main.main()
        /private/tmp/lazygit-20210605-59301-6hnv7l/lazygit-0.28.2/main.go:127 +0xb7b

how to reproduce

$ echo 'hello' > '"'
$ git add '"'
$ git commit -m 'test'

• Then launch lazygit and go to the commits panel
• Press enter on the "test" commit
• Crash

2. Fixed file checkout failing if filename contains spaces or starts with a hyphen

$ echo 'hello' > '--a'
$ git add -- '--a'
$ git commit -m 'test2'

• Then launch lazygit and go to the commits panel
• Press enter on the "test2" commit
• Press c on a file named --a

error: unknown option `a'
usage: git checkout [<options>] <branch>
   or: git checkout [<options>] [<branch>] -- <file>...

...

[mjarkk]

Do all special characters work with this change (/n, /r)