Don't log files that dont load throw error instead

remove swift-log dependency

Sources/HummingbirdMustache/Library+FileSystem.swift

@@ -3,7 +3,7 @@ import Logging
 
 extension HBMustacheLibrary {
     /// Load templates from a folder
-    func loadTemplates(from directory: String, withExtension extension: String = "mustache", logger: Logger?) {
+    func loadTemplates(from directory: String, withExtension extension: String = "mustache") throws {
         var directory = directory
         if !directory.hasSuffix("/") {
             directory += "/"
@@ -15,11 +15,12 @@ extension HBMustacheLibrary {
             guard path.hasSuffix(extWithDot) else { continue }
             guard let data = fs.contents(atPath: directory + path) else { continue }
             let string = String(decoding: data, as: Unicode.UTF8.self)
-            guard let template = try? HBMustacheTemplate(string: string) else {
-                logger?.error("Failed to load \(path)")
-                continue
+            let template: HBMustacheTemplate
+            do {
+                template = try HBMustacheTemplate(string: string)
+            } catch {
+                throw Error.failedToLoad(path, error)
             }
-            logger?.debug("Loading \(path)")
             // drop ".mustache" from path to get name
             let name = String(path.dropLast(extWithDot.count))
             register(template, named: name)