Build it piece by piece

Option to specify each section of script for each image/video transition. Right now an image can stay up for as long as 3 short sentences, we should be able to specify by the length of the words spoken in that specified section of script how long an image/video is generated for. Also, the maximum upload size of user images, and I assume shortly videos, needs to be increased substantially. Upscaled images can run more than 5mb and I think the limit right now is 2 or 2.5.