Add some new-style suite definitions

cpp/ql/src/codeql-suites/cpp-lgtm-full.qls

@@ -0,0 +1,14 @@
+- description: Standard LGTM queries for C/C++, including ones not displayed by default
+- qlpack: codeql-cpp
+- apply: lgtm-selectors.yml
+  from: codeql-suite-helpers
+# These queries are infeasible to compute on large projects:
+- exclude:
+    query path:
+      - Security/CWE/CWE-497/ExposedSystemData.ql
+      - Critical/DescriptorMayNotBeClosed.ql
+      - Critical/DescriptorNeverClosed.ql
+      - Critical/FileMayNotBeClosed.ql
+      - Critical/FileNeverClosed.ql
+      - Critical/MemoryMayNotBeFreed.ql
+      - Critical/MemoryNeverFreed.ql

cpp/ql/src/codeql-suites/cpp-lgtm.qls

@@ -0,0 +1,4 @@
+- description: Standard LGTM queries for C/C++
+- apply: codeql-suites/cpp-lgtm-full.qls
+- apply: lgtm-displayed-only.yml
+  from: codeql-suite-helpers

cpp/ql/src/qlpack.json

@@ -1,5 +1,6 @@
 {
     "name": "codeql-cpp",
     "version": "0.0.0",
-    "dbscheme": "semmlecode.cpp.dbscheme"
+    "dbscheme": "semmlecode.cpp.dbscheme",
+    "suites": "codeql-suites"
 }