Enhance cmder start directory.

The start directory of cmder is defined in that order:
1. The directory passed as parameter to the cmder executable
2. The `CMDER_START` environment variable
3. The `HOME` environment variable
4. The current user directory (`USERPROFILE` environment variable)

This commit also fix two issues:
* stating cmder with a path in parameter would set CMDER_START (whereas it may just be temporary)
* fix new line in cmd when starting cmder (this one was buggin me)

vendor/init.bat

@@ -37,12 +37,4 @@
 :: Set home path
 @if not defined HOME set HOME=%USERPROFILE%
 
-@if defined CMDER_START (
-    @cd /d "%CMDER_START%"
-) else (
-    @if "%CD%\" == "%CMDER_ROOT%" (
-        @cd /d "%HOME%"
-    )
-)
-
 :: @call "%CMDER_ROOT%/bin/agent.cmd"

vendor/profile.ps1

@@ -30,10 +30,3 @@ if (Get-Module posh-git) {
     Enable-GitColors
     Start-SshAgent -Quiet
 }
-
-# Move to the wanted location
-if (Test-Path Env:\CMDER_START) {
-    Set-Location -Path $Env:CMDER_START
-} elseif ($Env:CMDER_ROOT -and $Env:CMDER_ROOT.StartsWith($pwd)) {
-    Set-Location -Path $Env:USERPROFILE
-}