Remove .qm files from repo and auto-build them

Previously, translations were embedded manually, via src/resources.qrc

Now they are compiled and embedded automatically, using embed_translations,
which allows them to be correctly located for multiple targets or archs.

Note that RCC_DIR and LRELEASE_DIR can no longer be specified, because the
system defaults are necessary for multiple targets/archs to build correctly.

The version of Qt must be at least 5.12 for lrelease and embed_translations.

.gitignore

@@ -2,6 +2,7 @@
 Jamulus
 Jamulus.ini
 Makefile
+Makefile.*
 *.pro.user*
 **.cppe
 **.he
@@ -17,7 +18,11 @@ Makefile
 moc_*.cpp
 ui_*.h
 moc_predefs.h
-src/res/qrc_resources.cpp
+.qm/
+*.qm
+qmake_qmake_qm_files.qrc
+qrc_qmake_qmake_qm_files.cpp
+qrc_resources.cpp
 libs/ASIOSDK2
 windows/VC_redist.x64.exe
 windows/vc_redist.x86.exe

Jamulus.pro

@@ -1,5 +1,11 @@
 VERSION = 3.10.0dev
 
+# Using lrelease and embed_translations only works for Qt 5.12 or later.
+# See https://github.com/jamulussoftware/jamulus/pull/3288 for these changes.
+lessThan(QT_MAJOR_VERSION, 5) | equals(QT_MAJOR_VERSION, 5) : lessThan(QT_MINOR_VERSION, 12) {
+    error(Jamulus requires at least Qt5.12)
+}
+
 # use target name which does not use a capital letter at the beginning
 contains(CONFIG, "noupcasename") {
     message(The target name is jamulus instead of Jamulus.)
@@ -22,7 +28,8 @@ contains(VERSION, .*dev.*) {
 
 CONFIG += qt \
     thread \
-    lrelease
+    lrelease \
+    embed_translations
 
 QT += network \
     xml \
@@ -42,9 +49,8 @@ contains(CONFIG, "headless") {
     QT += multimedia
 }
 
-# Hint: When adding new translations, make sure to update
-# DISTFILES (above) and src/resources.qrc as well.
-LRELEASE_DIR = src/translation
+# Do not set LRELEASE_DIR explicitly when using embed_translations.
+# It doesn't work with multiple targets or architectures.
 TRANSLATIONS = src/translation/translation_de_DE.ts \
     src/translation/translation_fr_FR.ts \
     src/translation/translation_ko_KR.ts \
@@ -357,7 +363,8 @@ win32 {
     }
 }
 
-RCC_DIR = src/res
+# Do not set RCC_DIR explicitly when using embed_translations.
+# It doesn't work with multiple targets or architectures.
 RESOURCES += src/resources.qrc
 
 FORMS_GUI = src/aboutdlgbase.ui \
@@ -702,19 +709,6 @@ DISTFILES += ChangeLog \
     src/res/io.jamulus.jamulus.png \
     src/res/io.jamulus.jamulus.svg \
     src/res/io.jamulus.jamulusserver.svg \
-    src/translation/translation_de_DE.qm \
-    src/translation/translation_fr_FR.qm \
-    src/translation/translation_ko_KR.qm \
-    src/translation/translation_pt_PT.qm \
-    src/translation/translation_pt_BR.qm \
-    src/translation/translation_es_ES.qm \
-    src/translation/translation_nb_NO.qm \
-    src/translation/translation_nl_NL.qm \
-    src/translation/translation_pl_PL.qm \
-    src/translation/translation_it_IT.qm \
-    src/translation/translation_sv_SE.qm \
-    src/translation/translation_sk_SK.qm \
-    src/translation/translation_zh_CN.qm \
     src/res/CLEDBlack.png \
     src/res/CLEDBlackSmall.png \
     src/res/CLEDDisabledSmall.png \

src/resources.qrc

@@ -1,44 +1,4 @@
 <RCC>
-    <qresource prefix="/translations">
-        <file alias="translation_de">translation/translation_de_DE.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_fr">translation/translation_fr_FR.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_pt_PT">translation/translation_pt_PT.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_pt">translation/translation_pt_BR.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_es">translation/translation_es_ES.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_nb_NO">translation/translation_nb_NO.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_nl">translation/translation_nl_NL.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_it">translation/translation_it_IT.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_pl">translation/translation_pl_PL.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_sk">translation/translation_sk_SK.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_sv">translation/translation_sv_SE.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_zh_CN">translation/translation_zh_CN.qm</file>
-    </qresource>
-    <qresource prefix="/translations">
-        <file alias="translation_ko_KR">translation/translation_ko_KR.qm</file>
-    </qresource>
-
     <qresource prefix="/png/LEDs">
         <file>res/CLEDDisabled.png</file>
         <file>res/CLEDGrey.png</file>