download URLs

[ChristophLHR]

In comparison to the downloadGit function, this is superior but was never used. We should look into inserting it into the used function.
Especially in regards to the "UpdateObj", which is not used the downloadGit whatsoever.

    ---@param sourceObject table
    ---@param targetDirectory string
    ---@param updateObj table | nil
    ---@return table | nil
    ---@return boolean
    function Net:downloadURL(sourceObject, targetDirectory, updateObj)
        local sourceName = "default" or (updateObj and updateObj.sourceName)
        if updateObj then
            sourceObject.name = sourceObject.name or updateObj.name
        end

        if not sourceObject.name then
            sourceObject.name = self:getNameFromURL(sourceObject.source[sourceName])
        end
        local request = http.get(sourceObject.source[sourceName])

        if request then
            local content = request.readAll()
            request.close()

            if content then
                local file = fs.open(targetDirectory .. sourceObject.name, "w")
                if not file then
                    os.execute("mkdir " .. targetDirectory)
                    file = fs.open(targetDirectory .. sourceObject.name, "w")
                end
                file.write(content)
                file.close()

                return sourceObject, true
            end
        end

        return nil, false
    end

[ColdIV]

Also implement functionality to download single files.
I will close the issue #12 since that is basically the same.