Make the scripts runnable from anywhere

examples/run_all.ps1

@@ -14,6 +14,7 @@ foreach ($arg in $args) {
     }
 }
 
+cd "$PSScriptRoot"
 cargo build --bins
 
 foreach ($example in Get-ChildItem -Directory -Name) {

examples/run_all.sh

@@ -23,6 +23,7 @@ else
   sh_cmd='sh'
 fi
 
+cd "$(dirname $0)"
 cargo build --bins
 ls -F | grep '/$' | sed 's|/$||' | xargs -E '' -I {} $sh_cmd -c '
   # Continue without printing anything if the example is excluded in the manifest.