Faster dot source

[Jackbennett]

So this is a PR because I'd like to see some testing and hopefully some benchmarks regarding the speed increase. I've found it a bit random if it is faster or not.

This[1] blog post describes a faster method of importing use script into
the powershell session by loading the file contents into memory prior to
letting powershell parse them for auto-complete values.

Reference:

1: https://becomelotr.wordpress.com/2017/02/13/expensive-dot-sourcing/

Testing:

Test #1

dotsource(ms)	scriptblock(ms)	filename(test data)
18	13	Approve-Script.ps1
6	2	Clear-PrinterQueue.ps1
14	3	ConvertTo-ImageFormat.ps1
9	2	Copy-MultipleItems.ps1
6	2	Enter-RemoteSession.ps1
6	3	Get-CurrentUser.ps1
7	3	Get-LogonHistory.ps1
6	2	Get-SSID.ps1
6	2	Invoke-DscPullAndApply.ps1
8	3	Move-Drive.ps1
7	2	New-ComputerList.ps1
6	2	New-Directory.ps1
6	3	Set-Proxy.ps1
7	2	Shortcut.ps1
6	3	Start-Delprof.ps1
6	3	Suspend-Computer.ps1
9	4	SystemInformation.ps1
6	3	Test-ModuleSpeed.ps1
7	5	Test-TCPConnection.ps1
6	2	Update-ModuleReadMe.ps1
11	3	Watch-Here.ps1

Test #2

dotsource(ms)	scriptblock(ms)	filename(test data)
40	24	Approve-Script.ps1
8	4	Clear-PrinterQueue.ps1
24	12	ConvertTo-ImageFormat.ps1
14	8	Copy-MultipleItems.ps1
7	4	Enter-RemoteSession.ps1
10	4	Get-CurrentUser.ps1
30	6	Get-LogonHistory.ps1
6	4	Get-SSID.ps1
7	4	Invoke-DscPullAndApply.ps1
11	8	Move-Drive.ps1
11	5	New-ComputerList.ps1
11	4	New-Directory.ps1
6	5	Set-Proxy.ps1
11	5	Shortcut.ps1
10	12	Start-Delprof.ps1
12	5	Suspend-Computer.ps1
69	5	SystemInformation.ps1
11	4	Test-ModuleSpeed.ps1
6	7	Test-TCPConnection.ps1
8	4	Update-ModuleReadMe.ps1
10	9	Watch-Here.ps1

[Jackbennett]

I see what's happened here, my branch was created from the latest in master not development.