functions: add new helpers that create a dir and cd/pushd into it

A lot of places are currently doing:
    mkdir -p foo/bar
    cd foo/bar

Or even:
    mkdir -p foo/bar
    pushd foo/bar
    [...]
    popd

Provide both wrapper to ease doing this.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

scripts/functions

@@ -323,6 +323,22 @@ CT_Popd() {
     popd >/dev/null 2>&1
 }
 
+# Create a dir and cd or pushd into it
+# Usage: CT_mkdir_cd <dir/to/create>
+#        CT_mkdir_pushd <dir/to/create>
+CT_mkdir_cd() {
+    local dir="${1}"
+
+    mkdir -p "${dir}"
+    cd "${dir}"
+}
+CT_mkdir_pushd() {
+    local dir="${1}"
+
+    mkdir -p "${dir}"
+    CT_Pushd "${dir}"
+}
+
 # Creates a temporary directory
 # $1: variable to assign to
 # Usage: CT_MktempDir foo