lib/helpers: quotes for consistency

Quote some parameter uses that don't strictly require it, but since Bash needs so many quotes everywhere else my brain worms feel better when these are quoted too.

lib/helpers: simplify some quote escapes

lib/helpers.bash

@@ -119,7 +119,7 @@ function bash-it() {
 	shift
 	local func
 
-	case $verb in
+	case "$verb" in
 		show)
 			func="_bash-it-$component"
 			;;
@@ -487,7 +487,7 @@ function _bash-it-profile-save() {
 	local name="${1:-}"
 	while [[ -z "$name" ]]; do
 		read -r -e -p "Please enter the name of the profile to save: " name
-		case $name in
+		case "$name" in
 			"")
 				echo -e "${echo_orange?}Please choose a name.${echo_reset_color?}"
 				;;
@@ -499,12 +499,12 @@ function _bash-it-profile-save() {
 
 	local profile_path="${BASH_IT}/profiles/${name}.bash_it" RESP
 	if [[ -s "$profile_path" ]]; then
-		echo -e "${echo_yellow?}Profile \"$name\" already exists.${echo_reset_color?}"
+		echo -e "${echo_yellow?}Profile '$name' already exists.${echo_reset_color?}"
 		while true; do
 			read -r -e -n 1 -p "Would you like to overwrite existing profile? [y/N] " RESP
-			case $RESP in
+			case "$RESP" in
 				[yY])
-					echo -e "${echo_green?}Overwriting profile \"$name\"...${echo_reset_color?}"
+					echo -e "${echo_green?}Overwriting profile '$name'...${echo_reset_color?}"
 					rm "$profile_path"
 					break
 					;;
@@ -519,14 +519,13 @@ function _bash-it-profile-save() {
 		done
 	fi
 
-	local something_exists subdirectory
+	local something_exists subdirectory component_exists f enabled_file
 	echo "# This file is auto generated by Bash-it. Do not edit manually!" > "$profile_path"
 	for subdirectory in "plugins" "completion" "aliases"; do
-		local component_exists="" f
 		echo "Saving $subdirectory configuration..."
-		for f in "${BASH_IT}/$subdirectory/available/"*.bash; do
+		for f in "${BASH_IT}/$subdirectory/available"/*.bash; do
 			if _bash-it-component-item-is-enabled "$f"; then
-				if [[ -z "$component_exists" ]]; then
+				if [[ -z "${component_exists:-}" ]]; then
 					# This is the first component of this type, print the header
 					component_exists="yes"
 					something_exists="yes"
@@ -917,7 +916,7 @@ function _help-aliases() {
 	_example '$ alias-help git'
 
 	if [[ -n "$1" ]]; then
-		case $1 in
+		case "$1" in
 			custom)
 				alias_path='custom.aliases.bash'
 				;;