Merge JoinMarket-Org/joinmarket-clientserver#1364: Minor improvements for `install.sh` question prompts and feedback

bd5508c56b Minor improvements for question prompts and feedback (Kristaps Kaupe)

Pull request description:

  Make both look and act the same, specify default answer, wait only for single character (don't require Enter / Return) and give feedback about choice with Qt GUI (previously you could answer "yyy" and it would mean not to build Qt GUI, as "yyy" != "y").

Top commit has no ACKs.

Tree-SHA512: 4f51633217c791e6d129ec0f95d086fa35b990c0fe1b42d96052109ac88b2a2098e3cea834aed9b1ba99429a1568a25e4efb40fb2bd180bac5f8cdd7d95ac07f

install.sh

@@ -172,7 +172,8 @@ dar_deps_install ()
 check_skip_build ()
 {
     if [[ ${reinstall} == false ]] && [[ -d "$1" ]]; then
-        read -p "Directory ${1} exists.  Remove and recreate?  (y/n)  " q
+        read -n 1 -p "Directory ${1} exists.  Remove and recreate? (y/N) " q
+        echo ""
         if [[ "${q}" =~ Y|y ]]; then
             rm -rf "./${1}"
             mkdir -p "./${1}"
@@ -539,11 +540,15 @@ Options:
     done
 
     if [[ ${with_qt} == '' ]]; then
-        read -p "
+        read -n 1 -p "
         INFO: Joinmarket-Qt for GUI Taker and Tumbler modes is available.
-        Install Qt dependencies (~160mb) ? [y|n] : "
+        Install Qt dependencies (~160mb)? (y/N) "
+        echo ""
         if [[ ${REPLY} =~ y|Y ]]; then
+            echo "Building Qt GUI"
             with_qt='1'
+        else
+            echo "Not building Qt GUI"
         fi
     fi
 }