more robust references to script directory

logger.sh

@@ -1,6 +1,8 @@
 #!/bin/bash
 
-. /home/spezi/Scripts/utils/colors.sh
+# https://stackoverflow.com/a/246128
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+. $SCRIPT_DIR/colors.sh
 
 logger () {
     echo -e "${NC}$(date) - [$BASHPID] - [${0##*/}] - $@${NC}"

math.sh

@@ -1,6 +1,8 @@
 #!/bin/bash
-DIRECTORY=$(cd `dirname $0` && pwd)
-. /home/spezi/Scripts/utils/utils.sh
+
+# https://stackoverflow.com/a/246128
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+. $SCRIPT_DIR/utils.sh
 
 # https://unix.stackexchange.com/questions/66766/float-operation-with-bc
 # https://unix.stackexchange.com/questions/89712/how-to-convert-floating-point-number-to-integer