add tiny-AES128-C submodule: AES encryption/decryption

Source: https://github.com/kokke/tiny-AES128-C
License: public domain

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "libs/mavlink/include/mavlink/v2.0"]
 	path = libs/mavlink/include/mavlink/v2.0
 	url = https://github.com/mavlink/c_library_v2.git
+[submodule "libs/thirdParty/tiny-AES128-C"]
+	path = libs/thirdParty/tiny-AES128-C
+	url = https://github.com/bkueng/tiny-AES128-C.git

tiny-AES128-C @ 28fcc570

+Subproject commit 28fcc570b97aba1f05336a5f7b06e63dc165d962

qgroundcontrol.pro

@@ -585,6 +585,7 @@ HEADERS += \
     src/uas/UASInterface.h \
     src/uas/UASMessageHandler.h \
     src/AnalyzeView/LogDownloadController.h \
+    libs/thirdParty/tiny-AES128-C/aes.h \
 
 AndroidBuild {
 HEADERS += \
@@ -773,6 +774,7 @@ SOURCES += \
     src/uas/UAS.cc \
     src/uas/UASMessageHandler.cc \
     src/AnalyzeView/LogDownloadController.cc \
+    libs/thirdParty/tiny-AES128-C/aes.c \
 
 DebugBuild {
 SOURCES += \
@@ -850,6 +852,7 @@ INCLUDEPATH += \
     src/FirmwarePlugin \
     src/Vehicle \
     src/VehicleSetup \
+    libs/thirdParty/tiny-AES128-C \
 
 HEADERS+= \
     src/AutoPilotPlugins/AutoPilotPlugin.h \