introduce --verbosity flag rather than mixed logging settings; correct color misnaming to ANSI convention; added sanity-check; simplified hello-world; created FZF_USER_INPUT to replace the confusing FZF_HEAD and FZF_TAIL

zsh/lib/utils/environment.zsh

@@ -1,4 +1,5 @@
 __CHECK_REQUIRED_ENV() {
+	local SCWRYPTS_LOG_LEVEL=1
 	local VAR ERROR=0
 	REQUIRED_ENV=($(echo $REQUIRED_ENV | sed 's/\s\+/\n/g' | sort -u))
 	for VAR in ${REQUIRED_ENV[@]}; do __CHECK_ENV_VAR $VAR || ((ERROR+=1)); done