The Thousand-Pulsar-Array programme on MeerKAT – VIII. The subpulse modulation of 1198 pulsars by Song, X, Weltevrede, P, Szary, A, Wright, G, Keith, MJ, Basu, A, Johnston, S, Karastergiou, A, Main, RA, Oswald, LS, Parthasarathy, A, Posselt, B, Bailes, M, Buchner, S, Hugo, B, Serylak, M