mime_db: Add several missing text extensions

* Dog-fooding and keep having to manually open files
  in Pe since the types weren't detected.

src/data/mime_db/text/plain

@@ -6,6 +6,11 @@ resource(1, "META:TYPE") "text/plain";
 resource(2, "META:S:DESC") #'MSDC' "Text file";
 
 resource(3, "META:EXTENS") message(234) {
+	"extensions" = "cfg",
+	"extensions" = "conf",
+	"extensions" = "config",
+	"extensions" = "ini",
+	"extensions" = "log",
 	"extensions" = "txt",
 	"type" = "text/plain"
 };

src/data/mime_db/text/x-source-code

@@ -16,18 +16,31 @@ resource(4, "META:EXTENS") message(234) {
 	"extensions" = "c",
 	"extensions" = "cc",
 	"extensions" = "cpp",
+	"extensions" = "cs",
 	"extensions" = "e",
+	"extensions" = "go",
 	"extensions" = "h",
 	"extensions" = "h++",
+	"extensions" = "hpp",
 	"extensions" = "inc",
 	"extensions" = "java",
+	"extensions" = "js",
+	"extensions" = "json",
+	"extensions" = "jsp",
+	"extensions" = "lua",
 	"extensions" = "pas",
+	"extensions" = "php",
 	"extensions" = "pl",
 	"extensions" = "pp",
 	"extensions" = "py",
 	"extensions" = "rb",
 	"extensions" = "rexx",
+	"extensions" = "rs",
 	"extensions" = "S",
+	"extensions" = "swift",
+	"extensions" = "sql",
+	"extensions" = "toml",
+	"extensions" = "yaml",
 	"type" = "text/x-source-code"
 };